package com.zhangxi.fillter;


import com.alibaba.fastjson.JSON;
import helper.JwtHelper;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;
import result.Result;
import result.ResultCodeEnum;
import utils.ResponseUtil;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

/**
 * ClassName: TokenAuthenticationFilter
 * Package: com.zhangxi.fillter
 */
public class TokenAuthenticationFilter  extends OncePerRequestFilter{
    private RedisTemplate redisTemplate;

    public TokenAuthenticationFilter(RedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        logger.info("uri:"+request.getRequestURI());
        //如果是登录接口，直接放行
        if("/admin/system/index/login".equals(request.getRequestURI())) {
            chain.doFilter(request, response);
            return;
        }

        UsernamePasswordAuthenticationToken authentication = getAuthentication(request);
        if(null != authentication) {
            SecurityContextHolder.getContext().setAuthentication(authentication);
            chain.doFilter(request, response);
        } else {
            ResponseUtil.out(response, Result.build(null, ResultCodeEnum.PERMISSION));
        }
    }

//    private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request) {
//        // token置于header里
//        String token = request.getHeader("token");
//        logger.info("token:"+token);
//        if (!StringUtils.isEmpty(token)) {
//            String useruame = JwtHelper.getUsername(token);
//            logger.info("useruame:"+useruame);
//            if (!StringUtils.isEmpty(useruame)) {
//                return new UsernamePasswordAuthenticationToken(useruame, null, Collections.emptyList());
//            }
//        }
//        return null;
//    }
//}
private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request) {
    // token置于header里
    String token = request.getHeader("token");
    logger.info("token:"+token);
    if (!StringUtils.isEmpty(token)) {
        String useruame = JwtHelper.getUsername(token);
        logger.info("useruame:"+useruame);
        if (!StringUtils.isEmpty(useruame)) {
            String authoritiesString = (String) redisTemplate.opsForValue().get(useruame);
            List<Map> mapList = JSON.parseArray(authoritiesString, Map.class);
            List<SimpleGrantedAuthority> authorities = new ArrayList<>();
            for (Map map : mapList) {
                authorities.add(new SimpleGrantedAuthority((String)map.get("authority")));
            }
            return new UsernamePasswordAuthenticationToken(useruame, null, authorities);
            //return new UsernamePasswordAuthenticationToken(useruame, null, Collections.emptyList());
        }
    }
    return null;
}
}
